Horizontal Directional Drilling

Horizontal Directional Drilling is a trenchless excavation method that is accomplished in three phases and uses a specialized horizontal drilling rig with ancillary tools and equipment.

The Horizontal Directional Drilling technique has gained worldwide acceptance and is considered an established method for a variety of underground assignment for the installation of pipes and ducts with minimum disruption to the ground surface.

Horizontal Directional Drilling can be can be used in many drilling situations and variations of size depth and in many situations beneath large obstructions such as rivers, wetlands, highways, airfields and buildings.

Horizontal Directional Drilling is utilized in many fields including civil infrastructure, water abstraction and environmental monitoring and remediation.

The technique of Horizontal Directional Drillingrequires fairly sophisticated equipment and tooling and the experience of skilled operators.While it has its advantages, there are limitations for which the technique is suitable and it can be fraught with problems if undertaken by inexperienced contractors or with inadequate equipment.

Hydro Vacuum Excavation - Gold Coast - Horizontal Directional Drilling
Hydro Vacuum Excavation - Gold Coast - Horizontal Directional Drilling

Horizontal Directional Drillingcombines a steering technology and boring methods and the process involves the drilling of a pilot hole between two points along a planned route using a steerable drill stem creating an opening for the installation of a service to be fitted.

The first stage ofHorizontal Directional Drillingentails installing a pilot hole drilled from the surface at a pre-determined angle and along a prescribed path. The drill path comprises straight inclined and straight horizontal sections connected to large radii curves. The latter are dictated by the size of the drill string, pipe material and pipe diameter and are formed by a small kink, or bend, in the drill string just behind the drill head, termed a ‘bent sub’.

Steering is controlled by rotating the drill head to the desired direction and then pushing the drill string forward until the required direction is obtained, after which drilling is continued along the realigned path. The size of the pilot hole is dictated by, among others, soil conditions, the size of the drilling machine and the drilling method.

The second stage of Horizontal Directional Drilling enlarges the pilot hole by reaming to achieve the required size within which the product pipe or duct is to be installed and the final process of Horizontal Directional Drilling entails a specific algorithm for pulling the product pipe into the pre-drilled hole.

Horizontal Directional Drilling requires little, if any, excavation to install pipes and conduits in a range of lengths, sizes and depths along pre-assigned vertical and horizontal alignments.

In recent timesHorizontal Directional Drillinghas shown significant advancement with more innovative designs to optimize efficiency and these advances have made Horizontal Directional Drilling a competitive and cost effective alternative to conventional subsurface installation methods.

Projects that you once considered impossible can now be undertaken with the use of our Horizontal Directional Drilling equipment and Provac Australia Pty Ltd experienced professional operators.

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